Hello ! I've get a problem when 1.5 was relased,
I want to install the portal gun mod by iChun, so i've need forge.
But when i install forge, it says to me " Minecraft cannot lauch in it's current configuration"
So there is the part of ForgeModLoader-client-0.log were is deficient :
2013-03-23 16:21:17 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/scala-library.jar
2013-03-23 16:21:29 [LE PLUS FIN] [ForgeModLoader] Download complete
2013-03-23 16:21:29 [iNFO] [ForgeModLoader] Download complete
2013-03-23 16:21:29 [LE PLUS FIN] [ForgeModLoader] Library file scala-library.jar was downloaded and verified successfully
2013-03-23 16:21:36 [iNFO] [sTDERR] Exception in thread "Thread-3" java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
2013-03-23 16:21:36 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-03-23 16:21:36 [iNFO] [sTDERR] at net.minecraft.Launcher.replace(Launcher.java:153)
2013-03-23 16:21:36 [iNFO] [sTDERR] at net.minecraft.Launcher$1.run(Launcher.java:94)
2013-03-23 16:21:36 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.Class.getDeclaredConstructors0(Native Method)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.Class.getConstructor0(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.Class.newInstance0(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.Class.newInstance(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:96)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:271)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
2013-03-23 16:21:36 [iNFO] [sTDERR] ... 5 more
2013-03-23 16:21:36 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Multimap
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:134)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)
2013-03-23 16:21:36 [iNFO] [sTDERR] ... 13 more
I'm sorry for my english, I'm French
Ps: I've tried to install with the last version of forge for 1.5 (598) and the last version of forge for 1.5.1 (605)